Should I tell him how I know?

I was snooping and found out my boyfriend was logged into Facebook on my phone.. I found out that he has cheated on me with his best friend. I asked him about it but he doesn't know I know everything. Do I tell him I do?

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"C" CHEAT..Normally, I would say Let Sleeping dogs Lie with the 'Snooping,' However in this Case with this Doggie's Dirty Face, Let him Know, Let him Have it and Give him His Walking Papers... He IS Trying to Have his Sweet Cutie pie Cake and Eat it Two with Being... Secretive!Good luck. xx